tests/tools/test_kernel_data_trace.c

   1 /*
   2  * Copyright (c)  2011 David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * as published by the Free Software Foundation; only version 2
   7  * of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <assert.h>
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <time.h>
  27
  28 #include <bin/lttng-sessiond/trace-kernel.h>
  29 #include <common/defaults.h>
  30
  31 #include "utils.h"
  32
  33 /* This path will NEVER be created in this test */
  34 #define PATH1 "/tmp/.test-junk-lttng"
  35
  36 #define RANDOM_STRING_LEN       11
  37
  38 /* For lttngerr.h */
  39 int lttng_opt_quiet = 1;
  40 int lttng_opt_verbose;
  41
  42 static const char alphanum[] =
  43         "0123456789"
  44         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  45         "abcdefghijklmnopqrstuvwxyz";
  46
  47 static struct ltt_kernel_session *kern;
  48 static char random_string[RANDOM_STRING_LEN];
  49
  50 /*
  51  * Return random string of 10 characters.
  52  * Not thread-safe.
  53  */
  54 static char *get_random_string(void)
  55 {
  56         int i;
  57
  58         for (i = 0; i < RANDOM_STRING_LEN - 1; i++) {
  59                 random_string[i] = alphanum[rand() % (sizeof(alphanum) - 1)];
  60         }
  61
  62         random_string[RANDOM_STRING_LEN - 1] = '\0';
  63
  64         return random_string;
  65 }
  66
  67 static void create_one_kernel_session(void)
  68 {
  69         printf("Create kernel session: ");
  70         kern = trace_kernel_create_session(PATH1);
  71         assert(kern != NULL);
  72         PRINT_OK();
  73
  74         printf("Validating kernel session: ");
  75         assert(kern->fd == -1);
  76         assert(kern->metadata_stream_fd == -1);
  77         assert(kern->consumer_fds_sent == 0);
  78         assert(kern->channel_count == 0);
  79         assert(kern->stream_count_global == 0);
  80         assert(kern->metadata == NULL);
  81         PRINT_OK();
  82
  83         /* Init list in order to avoid sefaults from cds_list_del */
  84         trace_kernel_destroy_session(kern);
  85 }
  86
  87 static void create_kernel_metadata(void)
  88 {
  89         assert(kern != NULL);
  90
  91         printf("Create kernel metadata: ");
  92         kern->metadata = trace_kernel_create_metadata(PATH1);
  93         assert(kern->metadata != NULL);
  94         PRINT_OK();
  95
  96         printf("Validating kernel session metadata: ");
  97         assert(kern->metadata->fd == -1);
  98         assert(kern->metadata->conf != NULL);
  99         assert(kern->metadata->conf->attr.overwrite
 100                         == DEFAULT_CHANNEL_OVERWRITE);
 101         assert(kern->metadata->conf->attr.subbuf_size
 102                         == DEFAULT_METADATA_SUBBUF_SIZE);
 103         assert(kern->metadata->conf->attr.num_subbuf
 104                         == DEFAULT_METADATA_SUBBUF_NUM);
 105         assert(kern->metadata->conf->attr.switch_timer_interval
 106                         == DEFAULT_CHANNEL_SWITCH_TIMER);
 107         assert(kern->metadata->conf->attr.read_timer_interval
 108                         == DEFAULT_CHANNEL_READ_TIMER);
 109         assert(kern->metadata->conf->attr.output
 110                         == DEFAULT_KERNEL_CHANNEL_OUTPUT);
 111         PRINT_OK();
 112
 113         trace_kernel_destroy_metadata(kern->metadata);
 114 }
 115
 116 static void create_kernel_channel(void)
 117 {
 118         struct ltt_kernel_channel *chan;
 119         struct lttng_channel attr;
 120
 121         memset(&attr, 0, sizeof(attr));
 122
 123         printf("Creating kernel channel: ");
 124         chan = trace_kernel_create_channel(&attr, PATH1);
 125         assert(chan != NULL);
 126         PRINT_OK();
 127
 128         printf("Validating kernel channel: ");
 129         assert(chan->fd == -1);
 130         assert(chan->enabled == 1);
 131         assert(chan->stream_count == 0);
 132         assert(chan->ctx == NULL);
 133         assert(chan->channel->attr.overwrite  == attr.attr.overwrite);
 134         PRINT_OK();
 135
 136         /* Init list in order to avoid sefaults from cds_list_del */
 137         CDS_INIT_LIST_HEAD(&chan->list);
 138         trace_kernel_destroy_channel(chan);
 139 }
 140
 141 static void create_kernel_event(void)
 142 {
 143         struct ltt_kernel_event *event;
 144         struct lttng_event ev;
 145
 146         memset(&ev, 0, sizeof(ev));
 147         strncpy(ev.name, get_random_string(), LTTNG_KERNEL_SYM_NAME_LEN);
 148         ev.type = LTTNG_EVENT_TRACEPOINT;
 149         ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
 150
 151         printf("Creating kernel event: ");
 152         event = trace_kernel_create_event(&ev);
 153         assert(event != NULL);
 154         PRINT_OK();
 155
 156         printf("Validating kernel event: ");
 157         assert(event->fd == -1);
 158         assert(event->enabled == 1);
 159         assert(event->ctx == NULL);
 160         assert(event->event->instrumentation == LTTNG_KERNEL_TRACEPOINT);
 161         assert(strlen(event->event->name));
 162         PRINT_OK();
 163
 164         /* Init list in order to avoid sefaults from cds_list_del */
 165         CDS_INIT_LIST_HEAD(&event->list);
 166         trace_kernel_destroy_event(event);
 167 }
 168
 169 static void create_kernel_stream(void)
 170 {
 171         struct ltt_kernel_stream *stream;
 172
 173         printf("Creating kernel stream: ");
 174         stream = trace_kernel_create_stream("stream1", 0);
 175         assert(stream != NULL);
 176         PRINT_OK();
 177
 178         printf("Validating kernel stream: ");
 179         assert(stream->fd == -1);
 180         assert(stream->state == 0);
 181         PRINT_OK();
 182
 183         /* Init list in order to avoid sefaults from cds_list_del */
 184         CDS_INIT_LIST_HEAD(&stream->list);
 185         trace_kernel_destroy_stream(stream);
 186 }
 187
 188 int main(int argc, char **argv)
 189 {
 190         printf("\nTesting kernel data structures:\n-----------\n");
 191
 192         create_one_kernel_session();
 193
 194         create_kernel_metadata();
 195         create_kernel_channel();
 196
 197
 198         create_kernel_event();
 199
 200         create_kernel_stream();
 201
 202         /* Success */
 203         return 0;
 204 }